function search_go()
{
	var search_key = document.getElementById("search_key");
	var search_type = document.getElementById("search_type");
	if(search_key.value == "" || search_key.value == "请输入关键词")
	{	
		alert("请输入关键词");
		search_key.focus();
		return false;
	}
	window.location.href='search.php?search_key='+search_key.value+'&search_type='+search_type.value;
	return false;	
}